maths

Exterior angle= 360/n

Sum of exterior angles= 360

Interior angle= 180- EXTERIOR ANGLE

Sum of interior angles= (n- 2)*180

AREA of a triangle= 1/2 * base * vertical height

A= 1/2 * b * h

AREA of a parallelogram= base * vertical height

A= b * h

AREA of trapezium= average of parallel sided * distance between them

A= 1/2 * (a+b)* h

AREA of circle= pi *(radius)squared

A= pi * r squared

Circumference= C= pi * D

AREA of sector=  angle/ 360 * area of full circle

LENGTH of arc= angle/360 * circumference of full circle